Did you have any of these issues before the subframe was changed out?
Another suggestion would be to double check the tightness and torque on all subframe bolts to include the lower control arms and everything steering and suspension related. Something may have loosened up or dropped out. If you had the work done at a body shop this would hold true because I have never seen any mechanic at a body shop ever use a torque wrench. Also, check the motor/tranny mounts since most of them secure to the subframe and where the rack and pinion mounts to the subframe. Finally, you might check the torque of the axle nut on the hub assembly that was replaced. Just my 2 cents.
On the tranny check the tightness of the 20/25 way umbilical electrical connector. Remove and reconnect. It is located on the top of the driver's side of the tranny.
Good luck!